What is CVE-2025-6704?

CVE-2025-6704 is a critical-severity vulnerability in Sophos Firewall, classified under OS Command Injection. CVSS score: 9.8/10. Published 2025-07-21.

How severe is CVE-2025-6704?

Critical severity. CVSS v3 base score is 9.8 out of 10.

RCE in Sophos Firewall

CVE-2025-6704

An arbitrary file writing vulnerability in the Secure PDF eXchange (SPX) feature of Sophos Firewall versions older than 21.0 MR2 (21.0.2) can lead to pre-auth remote code execution, if a specific configuration of SPX is enabled in combinat…

Vulnerability class: Command Injection (OS Command Injection)

EPSS: 0.016 (81.9th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

Affected products

Sophos Firewall — versions 0

Weakness classification (CWE)

CWE-78 — OS Command Injection

References

www.sophos.com/en-us/security-advisories/sophos-sa-20250721-sfos-rce

Frequently asked questions

What is CVE-2025-6704?: CVE-2025-6704 is a critical-severity vulnerability in Sophos Firewall, classified under OS Command Injection. CVSS score: 9.8/10. Published 2025-07-21.
How severe is CVE-2025-6704?: Critical severity. CVSS v3 base score is 9.8 out of 10.